python - Split a string into all possible ordered phrases -

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i trying explore functionality of python's built-in functions. i'm trying work takes string such as:

'the fast dog'

and break string down possible ordered phrases, lists. example above output following:

[['the', 'fast dog'], ['the fast', 'dog'], ['the', 'fast', 'dog']]

the key thing original ordering of words in string needs preserved when generating possible phrases.

i've been able function work can this, cumbersome , ugly. however, wondering if of built-in functionality in python might of use. thinking might possible split string @ various white spaces, , apply recursively each split. might have suggestions?

using itertools.combinations:

import itertools  def break_down(text):     words = text.split()     ns = range(1, len(words)) # n = 1..(n-1)     n in ns: # split 2, 3, 4, ..., n parts.         idxs in itertools.combinations(ns, n):             yield [' '.join(words[i:j]) i, j in zip((0,) + idxs, idxs + (none,))]

example:

>>> x in break_down('the fast dog'): ...     print(x) ... ['the', 'fast dog'] ['the fast', 'dog'] ['the', 'fast', 'dog']  >>> x in break_down('the fast dog'): ...     print(x) ... ['the', 'really fast dog'] ['the really', 'fast dog'] ['the fast', 'dog'] ['the', 'really', 'fast dog'] ['the', 'really fast', 'dog'] ['the really', 'fast', 'dog'] ['the', 'really', 'fast', 'dog']

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